Our team


Andy Blow, Founder of Precision Hydration

Andy Blow, Founder
Loses 1842 mg of sodium per litre of sweat
Preloads and trains with PH 1500

In my slightly younger days I was an elite-level triathlete and have a few top 10 Ironman and 70.3 finishes to my name. I brought home an Xterra World Age Group title back in the year 2000.

Knee surgery forced me out of competitive triathlon a few years ago, but I still compete for fun at events like Coast to Coast New Zealand and OTillO Sweden. I get away with this because my incredibly supportive wife Lucy (and son Bobby) agree to pretend that these trips are in fact family holidays.

I’ve got a degree in Sport and Exercise Science and was once the Team Sports Scientist for Benetton and Renault F1 teams.

I learnt about hydration and electrolyte replenishment the hard way, by getting things very wrong and ending up in the medical tent of more than one hot-climate endurance event. It took a lot of frustrating trial and error to get to the bottom of my hydration problems. But it was totally worth it, as Precision Hydration was born out of this struggle.

Jonny Tye, Operations Director 

Jonny Tye, Operations Director
Loses 1064 mg of sodium per litre of sweat
Preloads with PH 1500, trains with PH 1000 and drinks PH 250 with the occasional G&T

Sport has played a huge part in my life. I played a lot of rugby at a young age (still a huge Gloucester fan) but quickly focussed on training as a flatwater canoeist. I was age-group National champion between 2007-12 and won my first major championship medal in 2009, a bronze at the European Marathon Championships. In 2011 I became a double Silver Medalist at the Marathon World Championships in Singapore; an experience I will never forget. 

I was introduced to Precision Hydration in the early days as an athlete testing their products and I fell in love with the concept; especially when I realised an H2Pro Hydrate 1500 knocked a hangover on the head! Pretty soon I was working with the guys at events and have never looked back...

There's nothing more satisfying than being part of a motivated and enthusiastic team working hard to build something great.

P.S. Don’t tell Dave Blow, but I'm actually planning on being the first to pedalo around the Isle of White backwards...


Dave Colley

 Dave Colley, Marketing Director

Loses 1024 mg of sodium per litre of sweat
Trains with PH 1000

I'm the athletic runt of the group, but I do dabble in a bit of hiking, counting the Three Peak Challenge, Tongariro Alpine Crossing and Salcantay Trek in the Andes amongst my favourite challenges. I also let my dad beat me on the bike from time to time...

But what I lack in sporting prowess, the guys reckon I more than make up for with brainpower, with a degree from Cambridge don't you know.


Sean O'Mahony

Sean O'Mahony, North American Operations Manager

Loses 687 mg of sodium per litre of sweat
Trains with PH 500, Preloads with PH 1500


Sean is based in Vancouver in beautiful British Columbia and supports our sales efforts in North America, particularly in Canada and the West Coast.

You'll find Sean over on our Strava group. It's the middle of road race season for him, so apparently he's hiding a lot of his training sessions on Strava. Anyone else out there do that? If you ever make it out to Vancouver and want to go on a training ride, just connect with him. He'll be happy to show you some awesome routes.


 Rob Morrison World Sailing Championships 

Rob Morrison, Events Manager

Loses 927 mg of sodium per litre of sweat
Trains with PH 1000

Like most of the guys around here, sport has played a huge part in my life. I grew up with gymnastics and competed all over the world, including Athens 2004 as a reservist, which was a fantastic experience. Unfortunately, I had to retire at 19 through injury.

I then studied Sport and Exercise Science but still needed to fill a void, which is how I discovered rugby. After University, I went on to play at the top of the amateur club level. Then my life took another swerve and my previous injuries finally overcame my desire to chase an egg shaped ball around a field.

I was then introduced to the world of sailing by a good friend of mine who wanted me to “come and pull a few ropes and join us for beers after”. I quickly discovered that I had pretty good sea legs and took to it very quickly. We entered some races, found we actually won some races and so we decided to enter into the next competitive season. 18 months later I walked away as a National Championship overall winner, J CUP winner, Vice Admirals Cup Winner, a European Championship Silver Medalist and a World Championship Gold Medalist. 

Dave Blow paddling

Dave Blow, Designer
Loses 1638 mg of sodium per litre of sweat
Preloads and trains with PH 1500 (The Blow brothers are salty sweaters...)


I started running cross country and racing cyclocross from an early age. This progressed into mountain biking (downhill and cross country). I qualified The Mega Avalanche Enduro race twice. And finished with no broken bones too. I also rode the Camino De Santiago, an off-road ride of over 1000km in just 10 days.

More recently I have focused on Surf Ski and K2 paddling, completing the Devizes to Westminster Kayak Marathon race twice. I’ve also done the Avon Descent Downriver K1 race in Perth, Australia.

I have a degree in Design worked with Redbull F1 and Muc-Off amongst others. When I’m not making Precision Hydration look awesome, I teach Graphics at a secondary school.

My secret ambition to be the first person to pedalo around the Isle of Wight, so watch this space!

Dr Raj Jutley, Co-founder and Head of Science.
Loses 512 mg of sodium per litre
Trains with H2Pro Hydrate 500


I'm an open heart surgeon by trade but I have a background in Motorsports. I'm a keen rally driver and have participated in a few rounds of the WRC over the years. Having raced extensively in Africa and delivering medical support to events such as the East African Safari Rally, I know first hand just how important a tailored hydration strategy can be in extreme conditions!

I first met Andy in the late 90s when he was working with the Benetton F1 team. I was able to help Andy with questions he had about the poor performances he was having due to high sodium losses in his endurance events. When this proved to be a game changer for him, we started to put together the basic concept that has grown into Precision Hydration today.